D7 Track-Type Tractor Electrohydraulic Systems Speed Sensor

Table 1
Machine ECM (MID 39)
J1939	CDL	Code Description	System Response
	585-2	Transmission Output Speed (TOS) Sensor #1: Data Erratic, Intermittent, or Incorrect	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between TOS 1 and TOS 2 sensors.
	585-5	Transmission Output Speed (TOS) Sensor #1: Current Below Normal	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between TOS 1 and TOS 2 sensors.
	585-6	Transmission Output Speed (TOS) Sensor #1: Current Above Normal	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between TOS 1 and TOS 2 sensors.
	585-8	Transmission Output Speed (TOS) Sensor #1: Abnormal Frequency, Pulse Width, or Period	Transmission shifting may be harsh. The transmission control may be unable to determine the direction of travel. The transmission control will be unable to determine the ground speed of the machine.
	673-2	Transmission Output Speed (TOS) Sensor #2: Data Erratic, Intermittent, or Incorrect	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between TOS 1 and TOS 2 sensors.
	673-5	Transmission Output Speed (TOS) Sensor #2: Current Below Normal	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between TOS 1 and TOS 2 sensors.
	673-6	Transmission Output Speed (TOS) Sensor #2: Current Above Normal	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between TOS 1 and TOS 2 sensors.
	673-8	Transmission Output Speed (TOS) Sensor #2: Abnormal Frequency, Pulse Width, or Period	Transmission shifting may be harsh. The transmission control may be unable to determine the direction of travel. The transmission control will be unable to determine the ground speed of the machine.
	674-5	Transmission Intermediate Speed Sensor #1: Current Below Normal	Transmission shifting may be harsh. Auto shift mode will not be available.
	674-6	Transmission Intermediate Speed Sensor #1: Current Above Normal	Transmission shifting may be harsh. Auto shift mode will not be available.
	675-5	Transmission Intermediate Speed Sensor #2: Current Below Normal	Transmission shifting may be harsh. Auto shift mode will not be available.
	675-6	Transmission Intermediate Speed Sensor #2: Current Above Normal	Transmission shifting may be harsh. Auto shift mode will not be available.
	4929-2	Transmission Input Speed #1 Sensor: Data Erratic, Intermittent, or Incorrect	Transmission shifting may be harsh. Auto shift mode will not be available.
	4930-2	Transmission Input Speed #2 Sensor: Data Erratic, Intermittent, or Incorrect	Transmission shifting may be harsh. Auto shift mode will not be available.
	6307-5	Torque Converter Output Speed Sensor #1: Current Below Normal	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between Torque converter output speed sensor #1 and Torque converter output speed sensor #2.
	6307-6	Torque Converter Output Speed Sensor #1: Current Above Normal	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between Torque converter output speed sensor #1 and Torque converter output speed sensor #2.
	6307-8	Torque Converter Output Speed Sensor #1: Abnormal Frequency, Pulse Width, or Period	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between Torque converter output speed sensor #1 and Torque converter output speed sensor #2.
	6308-5	Torque Converter Output Speed Sensor #2: Current Below Normal	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between Torque converter output speed sensor #1 and Torque converter output speed sensor #2.
	6308-6	Torque Converter Output Speed Sensor #2: Current Above Normal	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between Torque converter output speed sensor #1 and Torque converter output speed sensor #2.
	6308-8	Torque Converter Output Speed Sensor #2: Abnormal Frequency, Pulse Width, or Period	Transmission shifting may be harsh. The ECM determines if a problem exists by comparing the signal data between Torque converter output speed sensor #1 and Torque converter output speed sensor #2.

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Illustration 1	g06608019
Schematic of the Speed Sensors

The preceding diagram is a simplified schematic of the Machine ECM connections for the speed sensors. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of the electrical schematic for the specific machine being serviced for the complete schematic.

Diagnostic Trouble Code Procedure

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Table 2
Required Tools
Tool	Part Number	Description	Qty
T1	146-4080⁽¹⁾	Digital Multimeter Group	1
	8T-3224	Needle Tip Group	1
	7X-1710	Multimeter Probe Group	1
	8T-8726	Cable Assembly (Three Pin) (3-Pin Breakout)	1
T2	JERD2129	Cat^® Electronic Technician (Cat ET)	1
		Windows-based PC	1
	538-5051	Communication Adapter Gp	1
T3	6V-4148	Connector Repair Kit (Sure Seal)	1
T4	190-8900	Connector Field Repair Kit (Deutsch)	1
T5	175-3700	Connector Repair Kit Deutsch DT	1

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⁽¹⁾	This multimeter can use an RS232C cable to connect to a Laptop computer or Dataview tool gp for troubleshooting.

Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a troubleshooting procedure.

Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.

FMI 2 diagnostic code, proceed to "FMI 2".
FMI 5 diagnostic code, proceed to "FMI 5".
FMI 6 diagnostic code, proceed to "FMI 6".
FMI 8 diagnostic code, proceed to "FMI 8".

FMI 2

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Table 3
Check The Resistance Of The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch to the OFF position. 2. Disconnect the speed sensor from the machine harness. 3. Measure the resistance between contacts 1 and 2 of the connector for the speed sensor. 4. Refer to the table above for the correct resistance values.	The resistance values for the speed sensors are correct according to the table above.	Result: The resistance of the speed sensor is within the expected range. Proceed to "Check The Signal Circuit For An Open" Table 4. Result: The resistance of the speed sensor is outside the expected range. The speed sensor has failed. Repair: Replace the speed sensor. Proceed to "Check If The Diagnostic Code Remains" Table 6.

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Table 4
Check The Signal Circuit For An Open
Troubleshooting Test Steps	Values	Results
1. The key start switch and the disconnect switch remain in the OFF position. 2. Disconnect the speed sensor from the machine harness. 3. Disconnect the machine harness connectors from the ECM. 4. At the speed sensor harness connector, insert a jumper wire between the signal and return wires. 5. At the ECM harness connector, measure the resistance between the signal contact and the return contact.	The resistance value is less than 5 Ω.	Result: The resistance value is less than 5 Ω. The harness is correct. Proceed to "Check The Signal For A Short" Table 5. Result: The resistance is greater than 5K Ω. There is an open circuit in the signal circuit or the return circuit. Note: A resistance greater than 5 Ω but less than 5KΩ indicates a loose connection or corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 6.

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Table 5
Check The Signal For A Short
Troubleshooting Test Steps	Values	Results
1. Remove the jumper wire that was installed in the previous test step. 2. Reconnect the speed sensor to the machine harness. 3. At the ECM machine harness connectors, measure the resistance between the signal contact and all the other contacts that are used for the ECM. 4. At the ECM machine harness connectors, measure the resistance between the return contact and all the other contacts that are used for the ECM.	Each resistance value is greater than 5K Ω	Result: Each resistance value is greater than 5K Ω. Proceed to "Check If The Diagnostic Code Remains" Table 6. Result: A resistance value is less than 5 Ω. There is a short in the machine harness. The short is between the signal circuit or the return circuit and the circuit with low resistance. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 6.

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Table 6
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch ON. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in "ECM - Replace" if the ECM needs to be replaced. STOP.

FMI 5

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Table 7
Check The Power At The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch to the ON position. Do not start the engine. 2. Do not disconnect the harness connector from the sensor. 3. At the back of the harness connector for the sensor, insert a multimeter probe at the sensor power supply contact and the sensor ground contact. 4. Measure the voltage.	The voltage is 8 ± 0.5 VDC.	Result: The voltage of the speed sensor is within the expected range. Proceed to "Check The Ground Circuit Of The Machine Harness" Table 8. Result: The voltage of the speed sensor is outside the expected range. There is an open, or loose, connection in the circuit. Repair: Repair the machine harness or replace the machine harness. Poor connections are often the cause of a problem in electrical circuits. Inspect the harness connectors involved in the circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Proceed to "Check If The Diagnostic Code Remains" Table 10.

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Table 8
Check The Ground Circuit Of The Machine Harness
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch to the OFF position. Do not start the engine. 2. Disconnect the J1 and J2 harness connectors from the ECM. 3. At machine harness connector for the sensor, measure resistance between contact and the return to +battery. 4. Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through the full operating range.	The resistance value is less than 5 Ω.	Result: The resistance value is less than 5 Ω. The harness is correct. Proceed to "Check The Signal For A Short" Table 9. Result: The resistance is greater than 5K Ω. The harness has failed. Note: A resistance greater than 5 Ω but less than 5KΩ indicates a loose connection or corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 10.

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Table 9
Check The Signal For A Short to +Battery
Troubleshooting Test Steps	Values	Results
1. The ECM remains disconnected from the harness. 2. Disconnect the sensor from the harness. 3. At the ECM machine harness connectors, measure the resistance between the signal contact and all other +battery sources.	Each resistance value is greater than 5K Ω	Result: Each resistance value is greater than 5K Ω. Proceed to "Check If The Diagnostic Code Remains" Table 10. Result: A resistance value is less than 5 Ω. There is a short in the machine harness. The short is between the +battery and the signal circuit. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 10.

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Table 10
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch ON. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in "ECM - Replace" if the ECM needs to be replaced. STOP.

FMI 6

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Table 11
Check The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch to the ON position. 2. Verify that the diagnostic code is active. 3. Observe the status of the diagnostic code. Then, disconnect the sensor from the machine harness.	The FMI 6 changes to an FMI 5 after the sensor is disconnected.	Result: The FMI 6 does not change to an FMI 5 after the sensor is disconnected. Proceed to "Check The Machine Harness For A Short To Ground" Table 12 Result: The FMI 6 changes to an FMI 5 after the sensor is disconnected. Repair: Repeat the test. Verify the sensor failure. Replace the sensor. Proceed to "Check If The Diagnostic Code Remains" Table 13.

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Table 12
Check Machine Harness For A Short To Ground
Troubleshooting Test Steps	Values	Results
1. The sensor remains disconnected from the machine harness. 2. Turn the key start switch and the disconnect switch to the OFF position. 3. Disconnect the machine harness connector from the ECM. 4. At the machine harness connector, measure the resistance from the sensor supply contact to frame ground. Measure the resistance from the signal contact to all other contacts that are used in the ECM connectors.	The resistance measurements are greater than 5K Ω.	Result: The resistance values are greater than 5K Ω. The harness circuit is correct. Proceed to "Check If The Diagnostic Code Remains" Table 13. Result: A resistance value is less than 5 Ω. Repair: A short exists in the harness between the signal circuit and the circuit with the low-resistance value. Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω could indicate a loose connection or a corroded connection in the circuit. Proceed to "Check If The Diagnostic Code Remains" Table 13.

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Table 13
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch ON. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in "ECM - Replace" if the ECM needs to be replaced. STOP.

FMI 8

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Table 14
Verify The Software Version
Troubleshooting Test Steps	Values	Results
1. Check and record the latest software version for the machine electronic controls from SIS. 2. Verify that the latest version of software has been loaded to the ECM.	The software is current.	Result: All the software is current. Proceed to "Check The Resistance Of The Sensor" Table 15. Result: There is a more recent software release that is available. Proceed to "Check If The Diagnostic Code Remains" Table 18. Repair: Flash all controls with the latest software release. Refer to "ECM Software - Install"

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Table 15
Check The Resistance Of The Sensor
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and disconnect switch to the OFF position. 2. Disconnect the sensor from the machine harness. 3. Measure the resistance between contacts 1 and 2 of the connector for the speed sensor. 4. Refer to the table above for the correct resistance values.	The resistance values for the speed sensors are correct according to the table above.	Result: The resistance of the speed sensor is within the expected range. Proceed to "Check The Signal Circuit For An Open" Table 16. Result: The resistance of the speed sensor is outside the expected range. The speed sensor has failed. Repair- Replace the speed sensor. Proceed to "Check If The Diagnostic Code Remains" Table 18.

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Table 16
Check The Signal Circuit For An Open
Troubleshooting Test Steps	Values	Results
1. The key start switch and the disconnect switch remain in the OFF position. 2. Disconnect the machine harness connector from the sensor. 3. Disconnect the machine harness connectors from the ECM. 4. At the harness connector for the sensor, place a jumper wire between the signal contact and the return contact. 5. At machine harness connector for ECM, measure the resistance between the signal contact the return contact.	The resistance value is less than 5 Ω.	Result: The resistance value is less than 5 Ω. The harness is correct. Proceed to "Check The Signal Circuit For A Short" Table 17. Result: The resistance is greater than 5K Ω. There is an open circuit in the signal circuit or the return circuit. Note: A resistance greater than 5 Ω but less than 5KΩ indicates a loose connection or corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 18.

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Table 17
Check The Signal Circuit For A Short
Troubleshooting Test Steps	Values	Results
1. The disconnect switch and the key start switch remain OFF. 2. The sensor and the ECM remain disconnected from the harness. 3. Measure the resistance between the signal contact and all other contacts used in the ECM harness connectors.	The resistance values are greater than 5K Ω.	Result: The resistance values are greater than 5K Ω. The harness circuit is correct. Proceed to "Check If The Diagnostic Code Remains" Table 18. Result: A resistance value is less than 5 Ω. Repair: A short exists in the harness between the signal circuit and the circuit with the low-resistance value. Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Proceed to "Check If The Diagnostic Code Remains" Table 18.

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Table 18
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch ON. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in "ECM - Replace" if the ECM needs to be replaced. STOP.